Staff Software Engineer, Core

OneSignal is a leading omnichannel customer engagement solution, powering personalized customer journeys across mobile and web push notifications, in-app messaging, SMS, and email. On a mission to democratize engagement, we enable over a million businesses to keep their users - including readers, fans, players and shoppers - engaged and up to date by delivering billions of messages daily. 

1 in 5 new apps launches using OneSignal! We support companies in 140 countries, including Zynga, USA Today, Bitcoin.com, Eventbrite, Tribune, and many more - from startups and small businesses just getting off the ground to established companies communicating with millions of customers.

We’re Series C, venture-backed by SignalFire, Rakuten Ventures, Y Combinator, HubSpot, and BAM Elevate. We offer remote work as the default option in the United States in California, Colorado, Massachusetts, New York, New Jersey, Oregon, Pennsylvania, Texas, Utah and Washington. As well as in the UK and Singapore - with plans to expand the locations we support in the future. Some roles are hybrid roles and will be listed as such. We have offices in San Mateo, CA and London, UK, and offer flex seating options for employees to work together in-person where we don't have offices. Hiring in Singapore is done in partnership with a local PEO.

OneSignal has a lot of the great tech startup qualities you'd expect, but we don't stop there. Our massive scale and small team, emphasis on healthy life balance and kindness in all our interactions, and focus on ownership and personal growth make OneSignal a uniquely great place to work. 

  About The Team:

Scylla, Postgres, ClickHouse, and Redis comprise the core of our data infrastructure.  As such, they need to be performant and reliable for all our use cases.

As a Scylla & DB focused Software Engineer, you will primarily take ownership of our Scylla clusters and ensure they are used and managed with best practices at scale.  This includes improving uptime, latency, restorability, partitioning, etc.  You will also work closely with other engineers in moving and replicating data to optimal data stores.

Your secondary responsibilities will include learning Postgres and ClickHouse - schema and query design, partitioning strategies, etc, along with writing microservices.

Please consider applying even if you don’t meet all of the desired qualifications.

  What You'll Do

• Optimize a scaling strategy for our high performance Scylla clusters
• Design and optimize schemas, queries, indices, caches and more, primarily for Scylla, eventually for Postgres and ClickHouse
• Conduct data analysis and performance monitoring to identify areas for optimization and enhancement
• Collaborate closely with fellow engineers to architect and implement services required to back OneSignal’s product offerings
• Actively participate in peer code reviews and Technical Design Spec reviews, providing valuable technical insights to continuously improve our code base
• Work with the team to efficiently resolve production issues and ensure the system scales smoothly to meet the growing demands of our customers.
• Stay up-to-date with the latest industry trends and technologies, incorporating new ideas into our engineering processes
• Participate in production on-call rotation
• Debug production issues by utilizing metrics, logs, and distributed traces
• Design synchronous and asynchronous APIs for communicating between services in a large distributed system

  What You'll Bring:

• Significant experience optimizing Scylla at scale
• At least 8 years experience working as a software engineer
• Ability to work on a self-motivated team, high performing team
• Experience operating reliable production systems at scale
• Easily bored running tasks by hand and the ability to automate such tasks
• Experience with distributed system event streaming framework such as Apache Kafka
• Experience with Rust, Golang or other lower level languages.  Those with backgrounds in interpreted languages may have a steeper learning curve with Rust, but if you have worked on core components of very high throughput systems, please apply
• Ability to reason about how data flows through distributed systems
• Experience with Docker and Kubernetes

 

We value a variety of experiences, and these are not required. It would be a added bonus if you have experience in any of the following: 

• Experience with any of Redis, Kafka, Postgres, ClickHouse, gRPC
• Exp